Malicious PDF — malware analysis report

Static analysis result for SHA-256 36461f1044ac1606…

MALICIOUS

PDF

87.5 KB Created: 2021-06-26 20:58:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 991fd1b6ff7973634534ef0915f07be6 SHA-1: ee4dfdb5706da55dcb4bbad817310f2a32e32cb8 SHA-256: 36461f1044ac16069649f1db518a18cccf4be4f797881edffdcbe2fa917a3a35
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites for further exploitation or credential harvesting. No scripts were extracted, but the link farm structure is a common tactic for distributing malware or conducting phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/bc5d3d1e97eb32c82dbea78a5a63ea13/worisuriluz.pdf In PDF document text
    • http://stalmost.pl/userfiles/file/36883775878.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/80438235962.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/mefulasawexafixi.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/2b2a76b552e2d383d210cb26c0c410b5/magevilopawomukosidixo.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160778727c4364---95698292517.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/978aa1a10baf872964eaea2aec34b1d4/32434208401.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1607a083ec1cf8---kogosebenavotutodolam.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/8bdsui3c725elugnkb5lh3fsq2/mikujozijajuvunimizimorup.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/f0ae4e5e5cc2a432daa0ef7b80e844d3/79078814912.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/7feaac61b8c1530364dd8c5561d55dba/29288905417.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4b214135f919d10295996cac03e90652/mixegugovamu.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/f12d2fd864689a0e964885a09e9a060c/tefigizox.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16072476f98f78---bukotozakavunuw.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/jigusufelijuf.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/24361491004.pdfIn PDF document text
    • http://kalikraft.com/images/file/nefetemorupuj.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bea1be1b7b5---40682540675.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/d9ba31f76b4c72e0400f8b5bbcab5a15/kibatapodapuwisiwu.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080bf4820502---14975549829.pdfIn PDF document text
    • https://munord.com/wp-content/plugins/super-forms/uploads/php/files/235ce95747d1d381ca55e031f2369b5d/jaxiwot.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/5152081776.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=reference+for+masters+degree+samplePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E0 10916 bytes
SHA-256: 33c79c2ab36b64c2376d44eb7802bd6f31f63529efd1b178cf83395a882d35f6
font_01_sfnt_off00010bf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF8 17104 bytes
SHA-256: 4faa00ef576386eab79beea2e6dc49063cc80e871dff7e40a77162b19237c65f
font_02_sfnt_off0001387b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1387B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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